If noone else answers, I will give my unqualyfied answer...: Yes its a client with a backend written in Python (says the faq) which then must act as (or come together with) a webserver. So its also a webserver. Which means it would need to run unconfined (if used as is, a way to avoid that may be to install a URL request interceptor and let that call the backend using pyotherside). You won't get the ut look and feel, but you will get some morph issues. 😜
All in all given it uses responsive webdesign (not sure about that, I'm afraid it doesn't, you could try by making the browser window on desktop small and portrait) its an interesting candidate (for bringing an non ut app to ut) imho, but won't work out of the box if you wanted to do it properly.